Hello.
Jinnat are both good and evil.
They can be employed for any work.
I've been looking for an Ayaat for two years, At last found one, and another ayaat is still unavailable. Those ayaat for enslaving king of jinns.
In my opinion one shouldn't get into these practices, these practices are quite easy but most dangerous than summoning a demon.
Just as you can understand, everyone loves their freedom, and when it comes about getting enslaved by humans, they'll do their best to stop or kill practioner (doesn't matter whether they're good or evil).
There's two types of jinn, One is Human died and because of karma become jinn, and they live for 1000 and these being not so powerful,
and second Who Died in this world, and he made physical relation in that world with any women so When she gave birth to any jinn in that world that jinn will become as real jinns with lots of powers because he is not dead person he is real jinn bornin that world that type of jinns are very powerful because they born as jinn and they are real jinns. And they have powers to bring anything you wish and fulfill your every desires, and these genies lives 10,000 to ten lacs.
Although some them are very religious, they visits masjid at night to worship Allah or whatever.
And Amil always reminds visitors to not sleep middle of the maszid because genies doesn't like any humans to blocked their way, therefore they do attack on them(not fatally, but thunder slaps).
And it is even witnessed by my sceptic Muslim friend, who was possessed by a jinn, at time of exorcism when Amil him(means who possessed) he replied He wanted his soul with him due to His body and soul was completely holy. It was very dangerous exorcism.
By the way They're very friendly and funny creatures of Allah.